Multichannel driver controls automotive LEDs



A PWM linear LED driver, the AL1783Q from Diodes, provides independent control of brightness and color on all three of its channels. Used for automotive interior and exterior lighting, the AL1783Q delivers 250 mA per channel to support higher LED current ranges in a wider range of lighting applications.

The device allows vehicle occupants to change interior lighting colors to suit their mood. It simultaneously enables animated turn-indicator signals and exterior grill lighting for different road conditions. Three external REF pins are used to set LED current for each channel, while 40-kHz PWM provides independent dimming control.

Since higher voltage rails are often used to power vehicle subsystems, the AL1783Q operates from a 55-V rail, allowing it to accommodate increasing LED chain voltages. Protection functions include undervoltage lockout, overvoltage, and overtemperature, as well as LED open and short-circuit detection.

Qualified to AEC-Q100 requirements, the AL1783Q operates over a temperature range of -40°C to +125°C. It comes in a TSSOP-16EP package that has an exposed cooling pad for improved heat dissipation. The AL1783Q LED driver costs $0.43 each in lots of 2500 units.

AL1783Q product page

Diodes

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